redeem.js - Application to Redeem Paper

Q

What is the Application to Redeem Pape, redeem.js?

✍: FYIcenter.com

A

redeem.js is a client application using the Hyperledger Fabric Node.js SDK library to invoke the redeem() function of the papercontract running on the PaperNet.

1. View redeem.js source code:

(balaji)$ cd ~/hyperledger-binaries/fabric-samples
(balaji)$ cd commercial-paper/organization/digibank/application

(balaji)$ more redeem.js
/* SPDX-License-Identifier: Apache-2.0
 * This application has 6 basic steps:
 * 1. Select an identity from a wallet
 * 2. Connect to network gateway
 * 3. Access PaperNet network
 * 4. Construct request to issue commercial paper
 * 5. Submit transaction
 * 6. Process response
 */

'use strict';

// Bring key classes into scope, most importantly Fabric SDK network class
const fs = require('fs');
const yaml = require('js-yaml');
const { FileSystemWallet, Gateway } = require('fabric-network');
const CommercialPaper = require('../contract/lib/paper.js');

// A wallet stores a collection of identities for use
const wallet = new FileSystemWallet('../identity/user/balaji/wallet');

// Main program function
async function main() {

  // A gateway defines the peers used to access Fabric networks
  const gateway = new Gateway();

  // Main try/catch block
  try {

    // Specify userName for network access
    // const userName = 'isabella.issuer@magnetocorp.com';
    const userName = 'Admin@org1.example.com';

    // Load connection profile; will be used to locate a gateway
    let connectionProfile = yaml.safeLoad(fs.readFileSync('../gateway/networkConnection.yaml', 'utf8'));

    // Set connection options; identity and wallet
    let connectionOptions = {
      identity: userName,
      wallet: wallet,
      discovery: { enabled:false, asLocalhost: true }
    };

    // Connect to gateway using application specified parameters
    console.log('Connect to Fabric gateway.');

    await gateway.connect(connectionProfile, connectionOptions);

    // Access PaperNet network
    console.log('Use network channel: mychannel.');

    const network = await gateway.getNetwork('mychannel');

    // Get addressability to commercial paper contract
    console.log('Use org.papernet.commercialpaper smart contract.');

    const contract = await network.getContract('papercontract', 'org.papernet.commercialpaper');

    // redeem commercial paper
    console.log('Submit commercial paper redeem transaction.');

    const redeemResponse = await contract.submitTransaction('redeem', 'MagnetoCorp', '00001', 'DigiBank', '2020-11-30');

    // process response
    console.log('Process redeem transaction response.');

    let paper = CommercialPaper.fromBuffer(redeemResponse);

    console.log(`${paper.issuer} commercial paper : ${paper.paperNumber} successfully redeemed with ${paper.owner}`);
    console.log('Transaction complete.');

  } catch (error) {

    console.log(`Error processing transaction. ${error}`);
    console.log(error.stack);

  } finally {

    // Disconnect from the gateway
    console.log('Disconnect from Fabric gateway.')
    gateway.disconnect();

  }
}
main().then(() => {

  console.log('Redeem program complete.');

}).catch((e) => {

  console.log('Redeem program exception.');
  console.log(e);
  console.log(e.stack);
  process.exit(-1);

});

2. Run redeem.js:

(balaji)$ node redeem.js

Connect to Fabric gateway.
Use network channel: mychannel.
Use org.papernet.commercialpaper smart contract.
Submit commercial paper redeem transaction.
Process redeem transaction response.
MagnetoCorp commercial paper : 00001 successfully redeemed with MagnetoCorp
Transaction complete.
Disconnect from Fabric gateway.
Redeem program complete.

Note that how the gateway uses the networkConnection.yaml file to store the connection addresses and port number of PaperNet.

 

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2019-11-08, 239👍, 0💬